Yes, catmint repel mosquitoes with an oil in its leaves called nepetalactone. This natural oil works at least as well as DEET at keeping mosquitoes away. The big bonus is that your catmint does this just by growing in the ground. You don't need to spray anything on your skin to get the benefit.
I planted a thick row of Walker's Low along my back patio three years ago. The change during summer evenings has been clear. Before the catmint went in, sitting outside after dark meant swatting bugs the whole time. Now the area near the plants stays much more comfortable. When I brush past the leaves on my way to a chair, the burst of scent seems to boost the effect even more. It's not a perfect shield, but the upgrade is real.
Lab tests from a 2021 paper at two top schools back up what gardeners have said for years about this oil and bugs. Marco Gallio and his team found that nepetalactone flips on a pain receptor called TRPA1 in insects. This receptor makes bugs feel irritated and drives them away from the source. The key finding is that the human version of TRPA1 doesn't react to the same compound. That's why you enjoy the scent while mosquitoes hate it.
This receptor exists in many types of bugs, not just mosquitoes. The nepetalactone mosquito repellent effect also keeps flies and gnats at a safe distance from your yard. DEET works through a similar irritant path, but you have to rub it on your body. Your catmint just sits in the soil and puts its oils into the air around it. No bottles, no sprays, no sticky skin.
The catmint insect repellent power goes beyond biting bugs too. Gardeners report fewer aphids, squash bugs, and flea beetles in beds where catmint grows next to other plants. You can use catmint as a companion near your tomatoes, squash, or roses. The scent from the leaves creates a zone that many soft-bodied pests prefer to stay away from. Your whole bed benefits from having catmint nearby.
To get the best mosquito control, plant your catmint in groups of 3 to 5 near your outdoor seating. A cluster of plants puts more scent into the air than a single one spread out alone. Put them where you and your guests will brush the leaves as you walk past. That contact releases a fresh wave of oils that makes the repellent cloud stronger for a while.
Your garden catmint protects the area around the plants, not your skin. If you're heading into heavy mosquito country on a hike, you still need a topical spray. But for your patio, deck, or garden seating spot, a row of catmint can make summer nights outside far more pleasant. You trade a few minutes of planting for months of natural bug control every single year.
I've also noticed that the catmint repel mosquitoes effect grows stronger as the plants mature. My first-year plants put out a mild scent compared to my three-year-old clumps. The bigger the plant, the more leaf surface area it has to release oils into the air. Give your catmint a full season to fill out before you judge its bug-fighting power. By year two, you'll feel a real difference on your patio during warm evenings.
Read the full article: Catmint Plant Care and Growing Guide
